201155405 has 32 divisors (see below), whose sum is σ = 270667008. Its totient is φ = 142272000.

The previous prime is 201155393. The next prime is 201155411. The reversal of 201155405 is 504551102.

It is a happy number.

It is not a de Polignac number, because 201155405 - 2¹⁶ = 201089869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 439937 + ... + 440393.

It is an arithmetic number, because the mean of its divisors is an integer number (8458344).

Almost surely, 2^201155405 is an apocalyptic number.

It is an amenable number.

201155405 is a deficient number, since it is larger than the sum of its proper divisors (69511603).

201155405 is a wasteful number, since it uses less digits than its factorization.

201155405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 201155405 is about 14182.9265315731. The cubic root of 201155405 is about 585.9275275648.

The spelling of 201155405 in words is "two hundred one million, one hundred fifty-five thousand, four hundred five".